Parasitism
Parasitism is a symbiotic relationship that one species involved in the relationship benefits from, and the other loses from. An example would be the Sumatran Rhino or Asian Elephant and the Helminthes parasite. The Helminthes live in the stomachs of Rhinos or Elephants, moving with them and feeding on food scraps and the stomach lining of the host. The Helminthes parasites moved to new areas along with the elephants and rhinos.